Any house that has a chimney is likely to have a slanted roof to let snow fall off it. A roof would not present the world’s safest surface to work on if it were sitting on the ground; it basically invites you to twist an ankle. To make matters worse, that uneven surface is probably at least ten feet off the ground. This is not exactly a safe situation, especially considering that heavy materials and tools will also have to be carried up the ladder.

All in all, it is just a bad idea to attempt an already difficult, unfamiliar job in an environment that presents dangers. Attention has to be paid to a great many things, starting with identifying what caused the chimney to need repair. Fixing it without understanding fully what caused it to decay is asking to reconsider this DIY decision further down the line.

A chimney professional will start there, finding the faulty flashing or cracked mortar that started the problem and addressing that as part of his chimney repair. It does not do much good to repair only the chimney if something other than time is to blame for its deterioration. Furthermore, if the chimney is crumbling, the flue liner needs to be checked as well, as it could be dented or warped.

In the final analysis, chimney repair simply involves too much specialized awareness to be taken on by do-it-yourselfers. That awareness starts with the danger of working on a roof and extends to knowledge of waterproofing agents. With a poorly done job resulting in greater expense down the line, DIY chimney repair just is not worth the risks.